The -MPITRACE configuration option disables the tracing of events that do not
lead to an MPI event.  In this example, the routine 'foo' does not lead to an
MPI event, nor does "C &C::C(int, int) C".  If it is traced without -MPITRACE,
the output looks like:

TAU_DEFAULT group events will always be traced.

#=NO= =======================EVENT== ==TIME [us]= =NODE= =THRD= ==PARAMETER=
    1                      "EV_INIT"            0      0      0            3
    2     "int main(int, char **)  "            0      0      0            1
    3                 "MPI_Init()  "            0      0      0            1
    4                 "MPI_Init()  "            0      0      0           -1
    5                   "WALL_CLOCK"            0      0      0   1257293692
    6     "TauTraceClockOffsetStart"         1099      0      0            0
    7            "MPI_Comm_size()  "         1131      0      0            1
    8            "MPI_Comm_size()  "         1132      0      0           -1
    9            "MPI_Comm_rank()  "         1136      0      0            1
   10            "MPI_Comm_rank()  "         1136      0      0           -1
   11                         "foo "         1138      0      0            1
   12                         "foo "         1157      0      0           -1
   13          "C &C::C(int, int) C"         1177      0      0            1
   14          "C &C::C(int, int) C"         1178      0      0           -1
   15           "void C::method() C"         1180      0      0            1
   16              "MPI_Barrier()  "         1184      0      0            1
   17              "MPI_Barrier()  "         1217      0      0           -1
   18                 "MPI_Send()  "         1222      0      0            1
   19 "Message size sent to all node         1228      0      0            0
   20 "Message size sent to all node         1229      0      0         2048
   21 "Message size sent to all node         1229      0      0            0
   22                 "MESSAGE_SEND"         1230      0      0     19073024
   23                 "MPI_Send()  "         1235      0      0           -1
   24                 "MPI_Recv()  "         1239      0      0            1
   25 "Message size received from al         1262      0      0            0
   26 "Message size received from al         1262      0      0         2048
   27 "Message size received from al         1263      0      0            0
   28                 "MESSAGE_RECV"         1263      0      0     19073024
   29                 "MPI_Recv()  "         1263      0      0           -1
   30           "void C::method() C"         1272      0      0           -1
   31             "MPI_Finalize()  "         1275      0      0            1
   32       "TauTraceClockOffsetEnd"         4683      0      0            0
   33             "MPI_Finalize()  "         5889      0      0           -1
   34     "int main(int, char **)  "         5893      0      0           -1
   35                  "FLUSH_CLOSE"         5906      0      0            0
   36                   "WALL_CLOCK"         5907      0      0   1257293692



With -MPITRACE, it will look like:

#=NO= =======================EVENT== ==TIME [us]= =NODE= =THRD= ==PARAMETER=
    1                      "EV_INIT"            0      0      0            3
    2     "int main(int, char **)  "            0      0      0            1
    3                 "MPI_Init()  "            0      0      0            1
    4                 "MPI_Init()  "            0      0      0           -1
    5                   "WALL_CLOCK"            0      0      0   1257293547
    6     "TauTraceClockOffsetStart"         1050      0      0            0
    7            "MPI_Comm_size()  "         1090      0      0            1
    8            "MPI_Comm_size()  "         1091      0      0           -1
    9            "MPI_Comm_rank()  "         1095      0      0            1
   10            "MPI_Comm_rank()  "         1095      0      0           -1
   11           "void C::method() C"         1141      0      0            1
   12              "MPI_Barrier()  "         1144      0      0            1
   13              "MPI_Barrier()  "         1173      0      0           -1
   14                 "MPI_Send()  "         1179      0      0            1
   15 "Message size sent to all node         1185      0      0            0
   16 "Message size sent to all node         1186      0      0         2048
   17 "Message size sent to all node         1186      0      0            0
   18                 "MESSAGE_SEND"         1187      0      0     19073024
   19                 "MPI_Send()  "         1192      0      0           -1
   20                 "MPI_Recv()  "         1196      0      0            1
   21 "Message size received from al         1667      0      0            0
   22 "Message size received from al         1668      0      0         2048
   23 "Message size received from al         1668      0      0            0
   24                 "MESSAGE_RECV"         1668      0      0     19073024
   25                 "MPI_Recv()  "         1668      0      0           -1
   26           "void C::method() C"         1678      0      0           -1
   27             "MPI_Finalize()  "         1682      0      0            1
   28       "TauTraceClockOffsetEnd"         2144      0      0            0
   29             "MPI_Finalize()  "         3231      0      0           -1
   30     "int main(int, char **)  "         3233      0      0           -1
   31                  "FLUSH_CLOSE"         3245      0      0            0
   32                   "WALL_CLOCK"         3246      0      0   1257293547
